.midden {
    background-color: #F7F8F9;
    height: 800px;
}

.block_line {
    height: 20px;
}

.head_line {
    text-align: center;
    font: normal 700 25px/75px Microsoft YaHei;
    height: 75px;
    color: #32CA99;
}

.box {
    width: 1000px;
    height: 580px;
    background-color: #fff;
    margin: 0 auto;
    font: normal 400 20px/30px Microsoft YaHei;
    text-align: center;
}

.box .box1 {
    padding-top: 30px;
    height: 50px;
    line-height: 30px;
}

.box .box2 {
    text-align: left;
    margin: 20px auto;
    width: 700px;
    height: 300px;
}